Plastic.



COATING OR PLASTIC.

"mixed to etlier and itross Reference UNITED STATES PATENT osnrcn.

gamma- ALLSTON SARGENT, OF NEW YORK, N. Y.

To all whom it my concern:

Be it known that I, ALLSTON SaRGENT, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Plastics, of which the following is a specification.

My invention relates to lastics and more particularly to an art met 0d or process of manufacturin receptacles such as boxes, bins, cans an s for various uses.

The principal objects are to form quickly, cheaply and economicall such articles as mentioned so that they will have smooth interiors and be im 'ervious to moisture, and gases and partic arly non conductors of heat. These objects are obtained by the process as hereinafter set forth and claimed.

The preferred composition employed consists of an intimate mixture of h draulic lime or cement such as Portland gje n%fi comminumerial sub 1 as granu ate or broken cork and water. These ingredients are ressed into a suitable mold W e at norma atmospheric temperature. The mold consists of a box open at the top and a smaller core resting on the bottom of the box. The wet plastic mass is pressed around the sides of the core and over the top so that the receptacle is formed mouth downward. After setting for 36 to 48 hours the article is removed from the mold and coated or enameled on the interior as desired.

The cement should be of such a character as to form upon setting a hard, durable stonelike mass. A small percentage of sand may be mix ed with thecement if desired 517i; the results are not quite so good. Sufiicient ce ment is used not'only'to coat the particles of cork and cause them to adhere and form a unitary structure but to provide an. excess which may settle toward the core of the mold sothat the interior of the article formed is nearly solid cement, or cement and sand and consequently hard and dense. Suificient water is used to give the desired degree of plasticity and yet permit the particles of cement to settle down between the li hter particles of cork. If desired, chemicifis suc as alum may be contained in solution in the wa- Specification of Letters Patent.

Application filed November 29, 1907. Serial No. 404,882.

t'e'r or mixed with the cement for producing 4 rmsric.

Patented March 17, 1908.

colloidal effects and improving the impermeability of the product. The cork or other light insulatin material has a tendency to rise in the mofil so that a preponderance of the insulation is atthe exterior of the product. The largest particles of cork tend to come nearest the exterior, while the finest articles of cement settle toward the interior efore hardening. The receptacle is thus made hard, dense and smooth at the interior; where the contained articles come in contact with it and its insulating properties increase toward the exterior. When the cement employed does not give the finish desired, one or more coats of enamel may be a plied and repair of the receptacle is rendbred expeditious.

- What I claim is. I

lvThe art of forming receptacles which consists .in mixing cement, and water in proportijo'iisitg form a somewhat fluid but lastic mass, molding the same on a cgrg so tfi at the cement settles towards the core' and forms a relatively hard and dense interior surface for the receptacle.

2. The art of forming receptacles which consists in mixing cement and particles of lighter material with water in such proportions as to produce a consistency permittin .the cement to settle and the lighter materia to rise, molding the mixture and then allowing it to set.

3. The art of forming plastic receptacles which consists in mixing a material such as hydraulic cement with a comminuted material of irregular sized and shaped particles and water in such proportions as to produce a somewhat fluid mass, casting the same in a mold over a smooth core, so that the finer particles of the mixture settle toward the core, allowing the same to set and become hard, removin the hard receptacle and then coating it on tl ie "interior with a preparation, im ervious to gas and water.

testimony whereof I aifix my signature in presence of two witnesses.

ALLSTON SARGENTQ Witnesses: j

Roar. S. ALLYN, ARTHUR M. NELsoN.

g 'anulate dpor lg immu fti. 

